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I think, in some odd/ unconventional way, the Duchess is looking out for the twins. She is missing some social skills, but from this chapter, I can imagine she had to/was forced to create barriers with the people around her due to jealousy or greed. Hence, she solely focuses on being a superior asterol and training her granddaughter to be one too. I think she does not want the twins or Claire, at the bare minimum, to experience what she did growing up or at least what happened to previous twin relationships. As far as what we've seen she hasn't minded her own business, but she might be trying to avoid some unnecessary conflict for another asterol. But if she tries something else best believe I’m going to stand on business for my girls!!!